Air-compressor.



A. L. HARRISON; AIR COMPRESSOR, APELICATION FILED. NOV. 3. I916- Patemed Feb. 26,1918.

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Specification of Letters Patent.

' Application filed November 3; 1916. Serial No. 129,375.

11 '0 all whom z'tmay concern Be it known that I, ARTHUR LEONARD HARRISON, a subject of the Kin of Great Britain, and a resident of the city of Victoria, in the-Province of British Columbia, Canada, have invented certain new and useful Improvements in Air-Compressors, of j which the following is a specification.

My invention relates to improvements .in an compressors, pumps for air orwater, or the like, and the object of my invention is to provide a simple device of this nature which is 'valveless and capable of being constructed with the minimum number of parts, and which is practical and efiicient in operation.

1 attain this object by the construction illustrated in which I Fig. 1 is an end elevation of my device.

Fig. 2 is a cross section taken through the inlet and outlet openings.

Fig. 3 is a side elevation of the device.

Fig. 4 is a sectional plan view taken through'the inlet and outlet passages.

Fig. 5 is a sectional view showing the sleeve ports, taken on the line ab of Fig. 2.

Fig. 6 is a perspective view of the sleeve.

Similar figuresof reference indicate similar parts throughout the several views.

1 indicates, a stationary cylinder closed at both ends by flanges 2 and 3 and provided with a suitable baseplate4 whereby it may be secured in any desired location. Fitted into the cylinder so as to form a lining therefor is a cylindrical member 5 which is divided into two' portions by cutting it spirally and which member is secured to the cylinder by any suitable means so that a spiral groove 6 is provided in the interior of'the cylinder. The construction of'the member 5 and the method of fastening it to the cylinder is substantially the same as that fully described and illustrated with reference to a similar member found in my pending application Serial No. 119795, filed Se tember 12, 1916.

indicates the air inlet openin from which extend branches 8 and 9 eading through the wall of the member 5 at opposite ends thereof, and 10 indicates the outlet opening from which extend branches 11 and 12 also leading through the wall of member 5 at the opposite ends thereof, as shown m Fig. 4. The inlet and outlet openings are arranged diametrically opposlteeacb other the accompanying drawings in on the transverse axis of the cylinder, and the inner ends of the branches 8 and 9 are wider apart than the inner ends of the branches 11 and 12, the difi'erence in width being not less than. the width of any one of the sleeve ports, hereinafter described.

13 indicates a sleeve rotatably mounted in the bore of the member 5'and provided with a pair of diametrically oppositeslots 14 and 15, a set of ports 16--17'18 19 arranged circularly equidistant from each other adjacent one end, and a set of similarly arranged ports 20-212223 adjacent its other end. Each set of ports is staggered in pairs and the ports in each respective pair are arranged diametrically opposite each other, as shown in Figs. 5 and 6. The posi tions of the respective pairs of ports with relation to the inner ends of the inlet and outlet passages is such that the rotation of the sleeve 13 will bring ports 16 and 18 to register alternately with inlet branch 8 and ports 17 and 19 to register alternately with outlet branch 11, at one end of the cylinder, and ports 20 and 22 to register alternately with outlet branch 12 and ports 21 and 23 to register alternately with inlet branch 9, at the opposite end.

24 indicates a shaft of square section disposed centrally and rotatably between the flanges 2 and 3 and provided with turned ends 25 and 26 extending through stuffing boxes 27 and 28, on one of which ends 26, a pulley 29 may be mounted'so that shaft 24 may be rotated by any suitable dr1v1n means. Slidably mounted on shaft 24 an slidably fitting the bore of sleeve 13 is a piston 30, which piston is provided with pins 31 and 32 slidably engaging the slots 14 and 15 respectively of the sleeve, the pins bemg extended therethrough so as to engage the groove 6 at diametrically opposite pomts thereof. The piston may be mounted on ball bearings 33 and the pins 31 and 32 on ball bearings 34.

The operation of the device may be described briefly as follows :The inlet and outlet openings 7 and10 are connected respectively to suitable suction and discharge pipes, which pipes may be fitted with check valves, if desired. Assuming now that the parts are in the position shown in F1 .4.

Patented lFebEd, 1919.

On the shaft 24 being rotated the piston 30 and sleeve 13 will also rotate while at the same time the slidable engagement of the piston pins n the groove 6 will cause reciprocation of the piston. It will be seen, still referring to Fig. 4, that port l8is registering with inlet branch 8 and port 20 with outlet branch 12 so that it is evident that the reciprocating piston will draw in a charge of air into the right hand end of the cylinder through inlet branch 8 and force out any charge in the left hand end through outlet branch 12. Rotation of the sleeve one-quarter revolution will now close these ports and bring ports 21 and 19 to register respectively with theinlet and outlet branches 9 and 11 so that the return movement of the piston will draw in a charge of air through inlet branch 9 into the left hand end of the cylinder and force the charge outof the right hand end through outlet branch 11. Thus, continued reciprocation of the piston and rotation of the sleeve will cause the ports to register with the inlet and outlet branches at the proper times, a suction port and a discharge port being open at each end of the cylinder each quarter revolution, so that charges of air are drawn into, and discharged from, each end alternately of the cylinder.

What I claim as my invention is:

1. An air compressor comprising, a stationary cylinder having a spiral groove in the bore thereof and provided with diametrically located inlet and outlet passages for each end,'a piston rotatably mounted in said bore and having pins slidably engaging'the said groove at diametrically opposite points whereby rotation of the piston causes its reciprocation, means for rotating the piston,

- and means operated by the rotating piston for opening an inlet and an outlet passage at opposite ends of the cylinder simultaneously.

2. Anair compressor comprising, a stationary cylinder having a spiral groove in the bore thereof and provided with diametrically located inlet and outlet passages for each end, a rotatable sleeve fitting said bore, said sleeve being provided with diametrically opposite slots and spaced inlet and outlet ports adjacent each end adapted to register respectively with the said inlet and outlet passages as the sleeve rotates; and-a piston rotatably mounted in the said sleeve provided with pins extending slidably through said slots into said spiral groove whereby rotation ofythe piston causes its reciprocation.

3. An air compressor comprising, a stationary cylinder having a spiral groove in the bore thereof, a rotatable sleeve fitting said bore, said sleeve being provided with diametrically opposite slots and inlet and outlet ports arranged circularly equidistant from each other adjacent each end, the said inlet ports being in staggered relation to the said outlet ports, a piston rotatably mounted in said sleeve provided with pins extending through said slots into said -spiral groove whereby rotation of the piston causes its reciprocation and also rotation of the sleeve, and diametrically located inlet and outlet passages for each end of the cylinder with which the said inlet and outlet ports registerrespectively as the sleeve rotates.

4. An air compressor comprising a stationary cylinder having inlet and outlet ports at both ends of the cylinder, a rotatable member located within the cylinder controlling the opening and closing of the ports, and rotatable reciprocating means for drawing air into such cylinder through the inlet port and forcing air out through the outlet port alternately at opposite ends of the cylinder.

5. An air compressor comprising a chamber having an air inlet port at each end and an air outlet port at eachopposite end, a rotatable partition movable from end to end of the chamber, a rotatable member controlling the opening and closing of the said air inlets and outlets, and ports co-acting to feed air into the end of the chamber from which the partition moves and to discharge air from the opposite end of said chamber during the movement of the partition in either direction.

Dated at Victoria, B. (1, this 17th day of October, 1916.

\ ARTHUR LEONARD HARRISON. 

